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The cost of hiring a catering service to serve food for a party is ₱150 per head for 20 personsor less, ₱130 per head for 21 to 50 persons, and ₱110 per head for 51 to 100 persons. for 100or more persons, the cost is at ₱100 per head.a. illustrate the total cost as a piecewise function of the number of attendees of theparty.b. how much is the cost if there are 28 attendees in a business meeting?c. how much is the cost if there are 67 attendees in a birthday party?d. how much is the cost if there are 252 in a high school batch reunion?